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authorBrian King <brking@linux.vnet.ibm.com>2009-10-19 05:51:34 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-10-30 17:20:56 +1100
commit8be8cf5b47f72096e42bf88cc3afff7a942a346c (patch)
tree9adff0fa02123f48fbfa40abb55a5c01be8c2fa4 /arch/powerpc/platforms/pseries/Kconfig
parent6cff46f4bc6cc4a8a4154b0b6a2e669db08e8fd2 (diff)
powerpc: Add kdump support to Collaborative Memory Manager
When running Active Memory Sharing, the Collaborative Memory Manager (CMM) may mark some pages as "loaned" with the hypervisor. Periodically, the CMM will query the hypervisor for a loan request, which is a single signed value. When kexec'ing into a kdump kernel, the CMM driver in the kdump kernel is not aware of the pages the previous kernel had marked as "loaned", so the hypervisor and the CMM driver are out of sync. Fix the CMM driver to handle this scenario by ignoring requests to decrease the number of loaned pages if we don't think we have any pages loaned. Pages that are marked as "loaned" which are not in the balloon will automatically get switched to "active" the next time we touch the page. This also fixes the case where totalram_pages is smaller than min_mem_mb, which can occur during kdump. Signed-off-by: Brian King <brking@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/platforms/pseries/Kconfig')
-rw-r--r--arch/powerpc/platforms/pseries/Kconfig2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/platforms/pseries/Kconfig b/arch/powerpc/platforms/pseries/Kconfig
index 26a24bd9262..27554c807fd 100644
--- a/arch/powerpc/platforms/pseries/Kconfig
+++ b/arch/powerpc/platforms/pseries/Kconfig
@@ -60,7 +60,7 @@ config PPC_SMLPAR
config CMM
tristate "Collaborative memory management"
- depends on PPC_SMLPAR && !CRASH_DUMP
+ depends on PPC_SMLPAR
default y
help
Select this option, if you want to enable the kernel interface